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Contents
   6.1 Design and Implementation of Classes
         6.1.1 Public and Helper Classes
         6.1.2 Class Members
         6.1.3 Design Guidelines
         6.1.4 Documenting the Source Code
   6.2 Contracts and Invariants
         6.2.1 Contracts of Methods
         6.2.2 Invaraints of Classes
         6.2.3 Assertions
         6.2.4 Design by Contract
   6.3 The Canonical Form of Classes
         6.3.1 No-Argument Constructor
         6.3.2 Object Equality
         6.3.3 Hash Code of Objects
         6.3.4 Cloning Objects
         6.3.5 String Representation of Objects
         6.3.6 Serialization
   6.4 Unit Testing
         6.4.1 Simple Unit Testing
         6.4.2 JUnit – A Unit Testing Tool
         6.4.3 Testing Coverage Criteria
   6.5 Project Build
         6.5.1 Ant – A Build Tool

• List interface
• Source code: mylist/List.java
• Compile:
javac mylist/List.java
• Linked list implementation
• Source code: mylist/LinkedList.java
• Compile:
javac -source 1.4 mylist/LinkedList.java
• Simple unit test for linked list implementation
• Source code: test/LinkedListTest1.java
• Compile:
javac -source 1.4 test/LinkedListTest1.java
• Run:
• java -ea test.LinkedListTest1
• Simple unit test for linked list implementation, using assertions
• Source code: test/LinkedListTest2.java
• Source code: test/TestUtil.java
• Compile:
javac -source 1.4 test/LinkedListTest2.java
• Run:
• java -ea test.LinkedListTest2
• Simple unit test for linked list implementation, using  JUnit
• Source code: unittest/LinkedListUnitTest.java
• Compile:
javac unittest/LinkedListUnitTest.java
• Run:
• Using text-based test runner:
java -ea junit.textui.TestRunner unittest.LinkedListUnitTest
• Using Swing-based test runner:
java -ea junit.swingui.TestRunner unittest.LinkedListUnitTest